Re: [Xen-devel] Logging xen dmesg

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 19/08/2011 14:58, "John Backes" <john.backes@xxxxxxxxxxxxxxxxx> wrote:

> Hello,
> 
> I'm having a problem where the hypervisor is crashing when I call the
> verify_local_APIC() function and would like to see what the kernel
> prints out before it crashes.  I know I can use xm dmesg to see
> current/past kernel messages, but is there a way to view a log of the
> kernel messages so I can see what was printed before the hypervisor
> crashed?  Thanks in advance!

Options:
 1. Specify noreboot on Xen command line, and read last few lines of log off
the VGA text local console (if you have that set up rather than, say, an X
server).
 2. Set up a kdump crash kernel. I believe the kdump tools support reading
out things like the hypervisor console logs. I've never used kexec/kdump
myself however.
 3. Set up hypervisor logging over a serial line. Then all log data will be
dumped over the serial line before the hypervisor reboots itself.

 -- Keir

> - John
> 
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